Quote:The Sinclair Chamber Length Gauges are designed so the handloader can determine the true length of his rifle's chamber when measuring from the bolt face to the end of the chamber's neck. This measurement will tell you how much excess case length your chamber may have over published trim lengths in reloading handbooks.

The Sinclair Gauges are inserted into a fired, unprimed shortened case and then chambered into your rifle. The insert pushes back into the case when it contacts the end of your chamber. You then extract the case and measure the overall length. The gauge is made of 12L14 soft steel so it will not damage your chamber. Step-by-step instructions accompany each gauge. The gauges can be used over and over again.

The differences between published trim lengths and the actual length of your chamber can be quite significant. You could be over trimming your cases by .030 inch or more.

The 22 caliber gauge will not work on thin-necked cases such as the 22 Hornet, 218 Bee, or cartridges based on these cases. The 30 caliber gauge will not work on teh 30-30 Winchester. None of the gauges listed will work on tight-necked chambers except for the G-243T. Should not be used in handguns, semi automatic rifles, lever actions rifles and pump action rifles.

garyrapp55 Wrote:I know the book states a trim length. I understand you can get away with longer, and I have. How do I know when longer is too long?

Sorry if I broke a rule asking this here instead of the ammo section. These cases are in bolt gun only, specifically H mini.

Harpoon1 Wrote:Buy a borescope! Seriously, they’re less than $50, the video is incredibly clear and you’ll be able to see exactly how much room you have left with over sized brass. On top of being able to inspect and see exactly what condition the inside of your barrel is. Some of the best money I ever spent!

Kosh65 Wrote:For references………….what borescope did you purchase? Link? I was thinking of getting one for purchasing used firearms. Which according to my wife, I do all too often. lol

Quote:How do I know when longer is too long?

Zeneffect Wrote:Playing with trim length in quickload will change the chamber pressure modeling. Enough so that there is significant difference between 1.520 and 1.518. Just food for thought... bearing surface on the neck will change the pressure profile of a given charge. longer can push into the "dangerous" territory with the same max charge developed with a shorter trim length.

Quote:The differences between published trim lengths and the actual length of your chamber can be quite significant. You could be over trimming your cases by .030 inch or more.

Quote:By allowing your neck to remain longer than published trim to lengths. You can gain better support for your bullets if you are trying to load bullets to reach or come close to lands of your rifle chamber.

grayfox Wrote:If you stray beyond saami max length then the brass does not have room to expand forward during the firing stage. Other than your caliper saying >1.520", the next notification you might get is a kaboom. This also applies to whatever dimension your chamber is actually cut at, max brass length I mean.
Why o why do you even want/"need" to go there. If this is coming up then I would suggest a different issue is really happening, and it's leading you into dangerous territory.

In short, I personally disagree with your premise "you can get away with...". You can of course, think what you like.

Kosh65 Wrote:.010” is plenty of trim and from most data that I have read …….is the standard. No need to go any shorter if your chamber is @ saami specs.